International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage

Multilingual Technical Dictionary (MTD)
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Term No.Term Name/Term DescriptionAction
883
Monomolecular layer, monolayer
A layer of fatty acid or some heavy alcohol, one molecule thick, spread over the water surface for suppression of evaporation from water bodies......
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1030
Confining bed, Confining layer, or Confining stratum
An impervious stratum directly above or below one bearing water.
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1741
Double layer
Arrangements of two oppositely charged ions in layers near the surface of a clay particle.
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1917
Piliferous layer
The young superficial tissue of roots, producing the root hairs.
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2112
Bolster layer
Layer of lumps of non-weathered, coarse-leaved moss peat.
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3030
Viscous sub-layer
A rather thin fluid layer along the smooth boundary of a turbulent fluid flow, in which, due to the proximity of the wall, the turbulence pattern of flow cannot develop freely. Also termed `laminar boundary layer`. (See 3066)......
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3066
Boundary layer, Turbulent boundary layer, Laminar sublayer, Laminar boundary layer, or Laminar film
It is the region near the wall where there is a velocity variation in a water flow. The small laminar region close to the wall is frequently termed as `laminar sublayer`, `laminar boundary layer` or `laminar film`, while the turbulent zone is termed as the `turbulent boundary layer`......
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3069
Free layer
A boundary layer that has left or has detached from a surface and where the velocity gradient is much greater than elsewhere in the flow......
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3119
Saltation
Discontinuous motion of particles above the bed of a channel in series of short hops. Also refers to the same type of movement of soil particles over a land surface during wind erosion......
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3120
Saltation layer
The zone above the bed where the phenomenon of saltation occurs in flowing channel.
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3121
Saltation load
The material bouncing along the bed, or moved, directly or indirectly, by the impact of the bouncing particles.
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3122
Saltation load discharge
The amount of material moved in unit time due to saltation.
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6459
Saltation
Wind and/or water erosion initiated by soil particles bouncing low over an unprotected surface.
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6658
Life layer
1 - Shallow surface zone containing the biosphere.  2 - A zone of interaction between atmosphere and land or ocean surface. .....
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7649
Impermeable layer
A layer of soil resistant to penetration by water, air, or roots.
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7705
Mixing layer or Transition zone
The zone separating regions occupied by two physically or chemically different fluids. A gradient of the mixed fluid properties exists across the layer. .....
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